drivers/iommu/mtk_iommu_v1.c

   1 /*
   2  * IOMMU API for MTK architected m4u v1 implementations
   3  *
   4  * Copyright (c) 2015-2016 MediaTek Inc.
   5  * Author: Honghui Zhang <honghui.zhang@mediatek.com>
   6  *
   7  * Based on driver/iommu/mtk_iommu.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18 #include <linux/memblock.h>
  19 #include <linux/bug.h>
  20 #include <linux/clk.h>
  21 #include <linux/component.h>
  22 #include <linux/device.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/dma-iommu.h>
  25 #include <linux/err.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/io.h>
  28 #include <linux/iommu.h>
  29 #include <linux/iopoll.h>
  30 #include <linux/list.h>
  31 #include <linux/of_address.h>
  32 #include <linux/of_iommu.h>
  33 #include <linux/of_irq.h>
  34 #include <linux/of_platform.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/slab.h>
  37 #include <linux/spinlock.h>
  38 #include <asm/barrier.h>
  39 #include <asm/dma-iommu.h>
  40 #include <linux/init.h>
  41 #include <dt-bindings/memory/mt2701-larb-port.h>
  42 #include <soc/mediatek/smi.h>
  43 #include "mtk_iommu.h"
  44
  45 #define REG_MMU_PT_BASE_ADDR                    0x000
  46
  47 #define F_ALL_INVLD                             0x2
  48 #define F_MMU_INV_RANGE                         0x1
  49 #define F_INVLD_EN0                             BIT(0)
  50 #define F_INVLD_EN1                             BIT(1)
  51
  52 #define F_MMU_FAULT_VA_MSK                      0xfffff000
  53 #define MTK_PROTECT_PA_ALIGN                    128
  54
  55 #define REG_MMU_CTRL_REG                        0x210
  56 #define F_MMU_CTRL_COHERENT_EN                  BIT(8)
  57 #define REG_MMU_IVRP_PADDR                      0x214
  58 #define REG_MMU_INT_CONTROL                     0x220
  59 #define F_INT_TRANSLATION_FAULT                 BIT(0)
  60 #define F_INT_MAIN_MULTI_HIT_FAULT              BIT(1)
  61 #define F_INT_INVALID_PA_FAULT                  BIT(2)
  62 #define F_INT_ENTRY_REPLACEMENT_FAULT           BIT(3)
  63 #define F_INT_TABLE_WALK_FAULT                  BIT(4)
  64 #define F_INT_TLB_MISS_FAULT                    BIT(5)
  65 #define F_INT_PFH_DMA_FIFO_OVERFLOW             BIT(6)
  66 #define F_INT_MISS_DMA_FIFO_OVERFLOW            BIT(7)
  67
  68 #define F_MMU_TF_PROTECT_SEL(prot)              (((prot) & 0x3) << 5)
  69 #define F_INT_CLR_BIT                           BIT(12)
  70
  71 #define REG_MMU_FAULT_ST                        0x224
  72 #define REG_MMU_FAULT_VA                        0x228
  73 #define REG_MMU_INVLD_PA                        0x22C
  74 #define REG_MMU_INT_ID                          0x388
  75 #define REG_MMU_INVALIDATE                      0x5c0
  76 #define REG_MMU_INVLD_START_A                   0x5c4
  77 #define REG_MMU_INVLD_END_A                     0x5c8
  78
  79 #define REG_MMU_INV_SEL                         0x5d8
  80 #define REG_MMU_STANDARD_AXI_MODE               0x5e8
  81
  82 #define REG_MMU_DCM                             0x5f0
  83 #define F_MMU_DCM_ON                            BIT(1)
  84 #define REG_MMU_CPE_DONE                        0x60c
  85 #define F_DESC_VALID                            0x2
  86 #define F_DESC_NONSEC                           BIT(3)
  87 #define MT2701_M4U_TF_LARB(TF)                  (6 - (((TF) >> 13) & 0x7))
  88 #define MT2701_M4U_TF_PORT(TF)                  (((TF) >> 8) & 0xF)
  89 /* MTK generation one iommu HW only support 4K size mapping */
  90 #define MT2701_IOMMU_PAGE_SHIFT                 12
  91 #define MT2701_IOMMU_PAGE_SIZE                  (1UL << MT2701_IOMMU_PAGE_SHIFT)
  92
  93 /*
  94  * MTK m4u support 4GB iova address space, and only support 4K page
  95  * mapping. So the pagetable size should be exactly as 4M.
  96  */
  97 #define M2701_IOMMU_PGT_SIZE                    SZ_4M
  98
  99 struct mtk_iommu_domain {
 100         spinlock_t                      pgtlock; /* lock for page table */
 101         struct iommu_domain             domain;
 102         u32                             *pgt_va;
 103         dma_addr_t                      pgt_pa;
 104         struct mtk_iommu_data           *data;
 105 };
 106
 107 static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
 108 {
 109         return container_of(dom, struct mtk_iommu_domain, domain);
 110 }
 111
 112 static const int mt2701_m4u_in_larb[] = {
 113         LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
 114         LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
 115 };
 116
 117 static inline int mt2701_m4u_to_larb(int id)
 118 {
 119         int i;
 120
 121         for (i = ARRAY_SIZE(mt2701_m4u_in_larb) - 1; i >= 0; i--)
 122                 if ((id) >= mt2701_m4u_in_larb[i])
 123                         return i;
 124
 125         return 0;
 126 }
 127
 128 static inline int mt2701_m4u_to_port(int id)
 129 {
 130         int larb = mt2701_m4u_to_larb(id);
 131
 132         return id - mt2701_m4u_in_larb[larb];
 133 }
 134
 135 static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
 136 {
 137         writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
 138                         data->base + REG_MMU_INV_SEL);
 139         writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
 140         wmb(); /* Make sure the tlb flush all done */
 141 }
 142
 143 static void mtk_iommu_tlb_flush_range(struct mtk_iommu_data *data,
 144                                 unsigned long iova, size_t size)
 145 {
 146         int ret;
 147         u32 tmp;
 148
 149         writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
 150                 data->base + REG_MMU_INV_SEL);
 151         writel_relaxed(iova & F_MMU_FAULT_VA_MSK,
 152                 data->base + REG_MMU_INVLD_START_A);
 153         writel_relaxed((iova + size - 1) & F_MMU_FAULT_VA_MSK,
 154                 data->base + REG_MMU_INVLD_END_A);
 155         writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE);
 156
 157         ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
 158                                 tmp, tmp != 0, 10, 100000);
 159         if (ret) {
 160                 dev_warn(data->dev,
 161                          "Partial TLB flush timed out, falling back to full flush\n");
 162                 mtk_iommu_tlb_flush_all(data);
 163         }
 164         /* Clear the CPE status */
 165         writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
 166 }
 167
 168 static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
 169 {
 170         struct mtk_iommu_data *data = dev_id;
 171         struct mtk_iommu_domain *dom = data->m4u_dom;
 172         u32 int_state, regval, fault_iova, fault_pa;
 173         unsigned int fault_larb, fault_port;
 174
 175         /* Read error information from registers */
 176         int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST);
 177         fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA);
 178
 179         fault_iova &= F_MMU_FAULT_VA_MSK;
 180         fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA);
 181         regval = readl_relaxed(data->base + REG_MMU_INT_ID);
 182         fault_larb = MT2701_M4U_TF_LARB(regval);
 183         fault_port = MT2701_M4U_TF_PORT(regval);
 184
 185         /*
 186          * MTK v1 iommu HW could not determine whether the fault is read or
 187          * write fault, report as read fault.
 188          */
 189         if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
 190                         IOMMU_FAULT_READ))
 191                 dev_err_ratelimited(data->dev,
 192                         "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d\n",
 193                         int_state, fault_iova, fault_pa,
 194                         fault_larb, fault_port);
 195
 196         /* Interrupt clear */
 197         regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL);
 198         regval |= F_INT_CLR_BIT;
 199         writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);
 200
 201         mtk_iommu_tlb_flush_all(data);
 202
 203         return IRQ_HANDLED;
 204 }
 205
 206 static void mtk_iommu_config(struct mtk_iommu_data *data,
 207                              struct device *dev, bool enable)
 208 {
 209         struct mtk_smi_larb_iommu    *larb_mmu;
 210         unsigned int                 larbid, portid;
 211         struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 212         int i;
 213
 214         for (i = 0; i < fwspec->num_ids; ++i) {
 215                 larbid = mt2701_m4u_to_larb(fwspec->ids[i]);
 216                 portid = mt2701_m4u_to_port(fwspec->ids[i]);
 217                 larb_mmu = &data->smi_imu.larb_imu[larbid];
 218
 219                 dev_dbg(dev, "%s iommu port: %d\n",
 220                         enable ? "enable" : "disable", portid);
 221
 222                 if (enable)
 223                         larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
 224                 else
 225                         larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
 226         }
 227 }
 228
 229 static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data)
 230 {
 231         struct mtk_iommu_domain *dom = data->m4u_dom;
 232
 233         spin_lock_init(&dom->pgtlock);
 234
 235         dom->pgt_va = dma_alloc_coherent(data->dev, M2701_IOMMU_PGT_SIZE,
 236                                          &dom->pgt_pa, GFP_KERNEL);
 237         if (!dom->pgt_va)
 238                 return -ENOMEM;
 239
 240         writel(dom->pgt_pa, data->base + REG_MMU_PT_BASE_ADDR);
 241
 242         dom->data = data;
 243
 244         return 0;
 245 }
 246
 247 static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
 248 {
 249         struct mtk_iommu_domain *dom;
 250
 251         if (type != IOMMU_DOMAIN_UNMANAGED)
 252                 return NULL;
 253
 254         dom = kzalloc(sizeof(*dom), GFP_KERNEL);
 255         if (!dom)
 256                 return NULL;
 257
 258         return &dom->domain;
 259 }
 260
 261 static void mtk_iommu_domain_free(struct iommu_domain *domain)
 262 {
 263         struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 264         struct mtk_iommu_data *data = dom->data;
 265
 266         dma_free_coherent(data->dev, M2701_IOMMU_PGT_SIZE,
 267                         dom->pgt_va, dom->pgt_pa);
 268         kfree(to_mtk_domain(domain));
 269 }
 270
 271 static int mtk_iommu_attach_device(struct iommu_domain *domain,
 272                                    struct device *dev)
 273 {
 274         struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 275         struct mtk_iommu_data *data = dev_iommu_fwspec_get(dev)->iommu_priv;
 276         int ret;
 277
 278         if (!data)
 279                 return -ENODEV;
 280
 281         if (!data->m4u_dom) {
 282                 data->m4u_dom = dom;
 283                 ret = mtk_iommu_domain_finalise(data);
 284                 if (ret) {
 285                         data->m4u_dom = NULL;
 286                         return ret;
 287                 }
 288         }
 289
 290         mtk_iommu_config(data, dev, true);
 291         return 0;
 292 }
 293
 294 static void mtk_iommu_detach_device(struct iommu_domain *domain,
 295                                     struct device *dev)
 296 {
 297         struct mtk_iommu_data *data = dev_iommu_fwspec_get(dev)->iommu_priv;
 298
 299         if (!data)
 300                 return;
 301
 302         mtk_iommu_config(data, dev, false);
 303 }
 304
 305 static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
 306                          phys_addr_t paddr, size_t size, int prot)
 307 {
 308         struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 309         unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT;
 310         unsigned long flags;
 311         unsigned int i;
 312         u32 *pgt_base_iova = dom->pgt_va + (iova  >> MT2701_IOMMU_PAGE_SHIFT);
 313         u32 pabase = (u32)paddr;
 314         int map_size = 0;
 315
 316         spin_lock_irqsave(&dom->pgtlock, flags);
 317         for (i = 0; i < page_num; i++) {
 318                 if (pgt_base_iova[i]) {
 319                         memset(pgt_base_iova, 0, i * sizeof(u32));
 320                         break;
 321                 }
 322                 pgt_base_iova[i] = pabase | F_DESC_VALID | F_DESC_NONSEC;
 323                 pabase += MT2701_IOMMU_PAGE_SIZE;
 324                 map_size += MT2701_IOMMU_PAGE_SIZE;
 325         }
 326
 327         spin_unlock_irqrestore(&dom->pgtlock, flags);
 328
 329         mtk_iommu_tlb_flush_range(dom->data, iova, size);
 330
 331         return map_size == size ? 0 : -EEXIST;
 332 }
 333
 334 static size_t mtk_iommu_unmap(struct iommu_domain *domain,
 335                               unsigned long iova, size_t size)
 336 {
 337         struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 338         unsigned long flags;
 339         u32 *pgt_base_iova = dom->pgt_va + (iova  >> MT2701_IOMMU_PAGE_SHIFT);
 340         unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT;
 341
 342         spin_lock_irqsave(&dom->pgtlock, flags);
 343         memset(pgt_base_iova, 0, page_num * sizeof(u32));
 344         spin_unlock_irqrestore(&dom->pgtlock, flags);
 345
 346         mtk_iommu_tlb_flush_range(dom->data, iova, size);
 347
 348         return size;
 349 }
 350
 351 static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
 352                                           dma_addr_t iova)
 353 {
 354         struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 355         unsigned long flags;
 356         phys_addr_t pa;
 357
 358         spin_lock_irqsave(&dom->pgtlock, flags);
 359         pa = *(dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT));
 360         pa = pa & (~(MT2701_IOMMU_PAGE_SIZE - 1));
 361         spin_unlock_irqrestore(&dom->pgtlock, flags);
 362
 363         return pa;
 364 }
 365
 366 static const struct iommu_ops mtk_iommu_ops;
 367
 368 /*
 369  * MTK generation one iommu HW only support one iommu domain, and all the client
 370  * sharing the same iova address space.
 371  */
 372 static int mtk_iommu_create_mapping(struct device *dev,
 373                                     struct of_phandle_args *args)
 374 {
 375         struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 376         struct mtk_iommu_data *data;
 377         struct platform_device *m4updev;
 378         struct dma_iommu_mapping *mtk_mapping;
 379         struct device *m4udev;
 380         int ret;
 381
 382         if (args->args_count != 1) {
 383                 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
 384                         args->args_count);
 385                 return -EINVAL;
 386         }
 387
 388         if (!fwspec) {
 389                 ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_ops);
 390                 if (ret)
 391                         return ret;
 392                 fwspec = dev_iommu_fwspec_get(dev);
 393         } else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_ops) {
 394                 return -EINVAL;
 395         }
 396
 397         if (!fwspec->iommu_priv) {
 398                 /* Get the m4u device */
 399                 m4updev = of_find_device_by_node(args->np);
 400                 if (WARN_ON(!m4updev))
 401                         return -EINVAL;
 402
 403                 fwspec->iommu_priv = platform_get_drvdata(m4updev);
 404         }
 405
 406         ret = iommu_fwspec_add_ids(dev, args->args, 1);
 407         if (ret)
 408                 return ret;
 409
 410         data = fwspec->iommu_priv;
 411         m4udev = data->dev;
 412         mtk_mapping = m4udev->archdata.iommu;
 413         if (!mtk_mapping) {
 414                 /* MTK iommu support 4GB iova address space. */
 415                 mtk_mapping = arm_iommu_create_mapping(&platform_bus_type,
 416                                                 0, 1ULL << 32);
 417                 if (IS_ERR(mtk_mapping))
 418                         return PTR_ERR(mtk_mapping);
 419
 420                 m4udev->archdata.iommu = mtk_mapping;
 421         }
 422
 423         return 0;
 424 }
 425
 426 static int mtk_iommu_add_device(struct device *dev)
 427 {
 428         struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 429         struct dma_iommu_mapping *mtk_mapping;
 430         struct of_phandle_args iommu_spec;
 431         struct of_phandle_iterator it;
 432         struct mtk_iommu_data *data;
 433         struct iommu_group *group;
 434         int err;
 435
 436         of_for_each_phandle(&it, err, dev->of_node, "iommus",
 437                         "#iommu-cells", 0) {
 438                 int count = of_phandle_iterator_args(&it, iommu_spec.args,
 439                                         MAX_PHANDLE_ARGS);
 440                 iommu_spec.np = of_node_get(it.node);
 441                 iommu_spec.args_count = count;
 442
 443                 mtk_iommu_create_mapping(dev, &iommu_spec);
 444
 445                 /* dev->iommu_fwspec might have changed */
 446                 fwspec = dev_iommu_fwspec_get(dev);
 447
 448                 of_node_put(iommu_spec.np);
 449         }
 450
 451         if (!fwspec || fwspec->ops != &mtk_iommu_ops)
 452                 return -ENODEV; /* Not a iommu client device */
 453
 454         /*
 455          * This is a short-term bodge because the ARM DMA code doesn't
 456          * understand multi-device groups, but we have to call into it
 457          * successfully (and not just rely on a normal IOMMU API attach
 458          * here) in order to set the correct DMA API ops on @dev.
 459          */
 460         group = iommu_group_alloc();
 461         if (IS_ERR(group))
 462                 return PTR_ERR(group);
 463
 464         err = iommu_group_add_device(group, dev);
 465         iommu_group_put(group);
 466         if (err)
 467                 return err;
 468
 469         data = fwspec->iommu_priv;
 470         mtk_mapping = data->dev->archdata.iommu;
 471         err = arm_iommu_attach_device(dev, mtk_mapping);
 472         if (err) {
 473                 iommu_group_remove_device(dev);
 474                 return err;
 475         }
 476
 477         return iommu_device_link(&data->iommu, dev);;
 478 }
 479
 480 static void mtk_iommu_remove_device(struct device *dev)
 481 {
 482         struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 483         struct mtk_iommu_data *data;
 484
 485         if (!fwspec || fwspec->ops != &mtk_iommu_ops)
 486                 return;
 487
 488         data = fwspec->iommu_priv;
 489         iommu_device_unlink(&data->iommu, dev);
 490
 491         iommu_group_remove_device(dev);
 492         iommu_fwspec_free(dev);
 493 }
 494
 495 static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 496 {
 497         u32 regval;
 498         int ret;
 499
 500         ret = clk_prepare_enable(data->bclk);
 501         if (ret) {
 502                 dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret);
 503                 return ret;
 504         }
 505
 506         regval = F_MMU_CTRL_COHERENT_EN | F_MMU_TF_PROTECT_SEL(2);
 507         writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
 508
 509         regval = F_INT_TRANSLATION_FAULT |
 510                 F_INT_MAIN_MULTI_HIT_FAULT |
 511                 F_INT_INVALID_PA_FAULT |
 512                 F_INT_ENTRY_REPLACEMENT_FAULT |
 513                 F_INT_TABLE_WALK_FAULT |
 514                 F_INT_TLB_MISS_FAULT |
 515                 F_INT_PFH_DMA_FIFO_OVERFLOW |
 516                 F_INT_MISS_DMA_FIFO_OVERFLOW;
 517         writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);
 518
 519         /* protect memory,hw will write here while translation fault */
 520         writel_relaxed(data->protect_base,
 521                         data->base + REG_MMU_IVRP_PADDR);
 522
 523         writel_relaxed(F_MMU_DCM_ON, data->base + REG_MMU_DCM);
 524
 525         if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
 526                              dev_name(data->dev), (void *)data)) {
 527                 writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR);
 528                 clk_disable_unprepare(data->bclk);
 529                 dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq);
 530                 return -ENODEV;
 531         }
 532
 533         return 0;
 534 }
 535
 536 static const struct iommu_ops mtk_iommu_ops = {
 537         .domain_alloc   = mtk_iommu_domain_alloc,
 538         .domain_free    = mtk_iommu_domain_free,
 539         .attach_dev     = mtk_iommu_attach_device,
 540         .detach_dev     = mtk_iommu_detach_device,
 541         .map            = mtk_iommu_map,
 542         .unmap          = mtk_iommu_unmap,
 543         .iova_to_phys   = mtk_iommu_iova_to_phys,
 544         .add_device     = mtk_iommu_add_device,
 545         .remove_device  = mtk_iommu_remove_device,
 546         .pgsize_bitmap  = ~0UL << MT2701_IOMMU_PAGE_SHIFT,
 547 };
 548
 549 static const struct of_device_id mtk_iommu_of_ids[] = {
 550         { .compatible = "mediatek,mt2701-m4u", },
 551         {}
 552 };
 553
 554 static const struct component_master_ops mtk_iommu_com_ops = {
 555         .bind           = mtk_iommu_bind,
 556         .unbind         = mtk_iommu_unbind,
 557 };
 558
 559 static int mtk_iommu_probe(struct platform_device *pdev)
 560 {
 561         struct mtk_iommu_data           *data;
 562         struct device                   *dev = &pdev->dev;
 563         struct resource                 *res;
 564         struct component_match          *match = NULL;
 565         struct of_phandle_args          larb_spec;
 566         struct of_phandle_iterator      it;
 567         void                            *protect;
 568         int                             larb_nr, ret, err;
 569
 570         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 571         if (!data)
 572                 return -ENOMEM;
 573
 574         data->dev = dev;
 575
 576         /* Protect memory. HW will access here while translation fault.*/
 577         protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2,
 578                         GFP_KERNEL | GFP_DMA);
 579         if (!protect)
 580                 return -ENOMEM;
 581         data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
 582
 583         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 584         data->base = devm_ioremap_resource(dev, res);
 585         if (IS_ERR(data->base))
 586                 return PTR_ERR(data->base);
 587
 588         data->irq = platform_get_irq(pdev, 0);
 589         if (data->irq < 0)
 590                 return data->irq;
 591
 592         data->bclk = devm_clk_get(dev, "bclk");
 593         if (IS_ERR(data->bclk))
 594                 return PTR_ERR(data->bclk);
 595
 596         larb_nr = 0;
 597         of_for_each_phandle(&it, err, dev->of_node,
 598                         "mediatek,larbs", NULL, 0) {
 599                 struct platform_device *plarbdev;
 600                 int count = of_phandle_iterator_args(&it, larb_spec.args,
 601                                         MAX_PHANDLE_ARGS);
 602
 603                 if (count)
 604                         continue;
 605
 606                 larb_spec.np = of_node_get(it.node);
 607                 if (!of_device_is_available(larb_spec.np))
 608                         continue;
 609
 610                 plarbdev = of_find_device_by_node(larb_spec.np);
 611                 if (!plarbdev) {
 612                         plarbdev = of_platform_device_create(
 613                                                 larb_spec.np, NULL,
 614                                                 platform_bus_type.dev_root);
 615                         if (!plarbdev) {
 616                                 of_node_put(larb_spec.np);
 617                                 return -EPROBE_DEFER;
 618                         }
 619                 }
 620
 621                 data->smi_imu.larb_imu[larb_nr].dev = &plarbdev->dev;
 622                 component_match_add_release(dev, &match, release_of,
 623                                             compare_of, larb_spec.np);
 624                 larb_nr++;
 625         }
 626
 627         data->smi_imu.larb_nr = larb_nr;
 628
 629         platform_set_drvdata(pdev, data);
 630
 631         ret = mtk_iommu_hw_init(data);
 632         if (ret)
 633                 return ret;
 634
 635         ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
 636                                      dev_name(&pdev->dev));
 637         if (ret)
 638                 return ret;
 639
 640         iommu_device_set_ops(&data->iommu, &mtk_iommu_ops);
 641
 642         ret = iommu_device_register(&data->iommu);
 643         if (ret)
 644                 return ret;
 645
 646         if (!iommu_present(&platform_bus_type))
 647                 bus_set_iommu(&platform_bus_type,  &mtk_iommu_ops);
 648
 649         return component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
 650 }
 651
 652 static int mtk_iommu_remove(struct platform_device *pdev)
 653 {
 654         struct mtk_iommu_data *data = platform_get_drvdata(pdev);
 655
 656         iommu_device_sysfs_remove(&data->iommu);
 657         iommu_device_unregister(&data->iommu);
 658
 659         if (iommu_present(&platform_bus_type))
 660                 bus_set_iommu(&platform_bus_type, NULL);
 661
 662         clk_disable_unprepare(data->bclk);
 663         devm_free_irq(&pdev->dev, data->irq, data);
 664         component_master_del(&pdev->dev, &mtk_iommu_com_ops);
 665         return 0;
 666 }
 667
 668 static int __maybe_unused mtk_iommu_suspend(struct device *dev)
 669 {
 670         struct mtk_iommu_data *data = dev_get_drvdata(dev);
 671         struct mtk_iommu_suspend_reg *reg = &data->reg;
 672         void __iomem *base = data->base;
 673
 674         reg->standard_axi_mode = readl_relaxed(base +
 675                                                REG_MMU_STANDARD_AXI_MODE);
 676         reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM);
 677         reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
 678         reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL);
 679         return 0;
 680 }
 681
 682 static int __maybe_unused mtk_iommu_resume(struct device *dev)
 683 {
 684         struct mtk_iommu_data *data = dev_get_drvdata(dev);
 685         struct mtk_iommu_suspend_reg *reg = &data->reg;
 686         void __iomem *base = data->base;
 687
 688         writel_relaxed(data->m4u_dom->pgt_pa, base + REG_MMU_PT_BASE_ADDR);
 689         writel_relaxed(reg->standard_axi_mode,
 690                        base + REG_MMU_STANDARD_AXI_MODE);
 691         writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM);
 692         writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
 693         writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL);
 694         writel_relaxed(data->protect_base, base + REG_MMU_IVRP_PADDR);
 695         return 0;
 696 }
 697
 698 static const struct dev_pm_ops mtk_iommu_pm_ops = {
 699         SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
 700 };
 701
 702 static struct platform_driver mtk_iommu_driver = {
 703         .probe  = mtk_iommu_probe,
 704         .remove = mtk_iommu_remove,
 705         .driver = {
 706                 .name = "mtk-iommu-v1",
 707                 .of_match_table = mtk_iommu_of_ids,
 708                 .pm = &mtk_iommu_pm_ops,
 709         }
 710 };
 711
 712 static int __init m4u_init(void)
 713 {
 714         return platform_driver_register(&mtk_iommu_driver);
 715 }
 716 subsys_initcall(m4u_init);